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海南省踏王山金矿区花岗岩地球化学特征及其地质意义
- 作者：
- 郭旻
- 作者单位：
- is null
基金项目：
- isnull
详细信息：
- 作者简介：
- 郭旻（1986—），男，江西吉安人，工程师，从事矿山工程设计及矿产勘查方面工作；合肥市包河区武汉路230号五矿大厦，五矿矿业（安徽）工程设计有限公司，230601；E-mail：csuguomin@qq.com
- 通讯作者：
- isnull
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Geochemical characteristics of granite in the Tawangshan Gold District,Hainan Province and its geological significance
- English Author：
- Minmetals Mining(Anhui)Engineering Co.,Ltd.
- Unit：
- 摘要
- 在线预览
- 参考文献
摘要:
踏王山金矿床位于海南省西南部戈枕韧性剪切带东南部，矿区出露的花岗岩主要为印支期似斑状花岗岩和燕山期黑云母花岗岩，矿体主要与似斑状花岗岩有关。岩石地球化学研究特征结果显示：w(K2O)>w(Na2O)，里特曼指数为0.49~2.39，矿区花岗岩属于钙性-高钾钙碱性岩石，似斑状花岗岩属于S型花岗岩，而黑云母花岗岩属于I型花岗岩。稀土元素质量分数偏低，轻稀土元素分馏程度明显大于重稀土元素，具有铕负异常，且明显富集大离子亲石元素，亏损高场强元素。似斑状花岗岩形成于大陆碰撞的动力学环境，源区岩石类型为含水富黏土泥质岩；黑云母花岗岩形成于火山弧环境，源区岩石类型为变杂砂岩、砂质碎屑岩。
关键词:
似斑状花岗岩；黑云母花岗岩；岩石地球化学特征；构造环境；踏王山金矿床
Abstract:
The Tawangshan Gold Deposit is located in the southwest of the Gezhen ductile shear zone in southwestern Hainan Province.The outcropped granite is mainly Indosinian porphyritic granite and Yanshanian biotite granite and the ore body is mainly related to porphyric granite.The litho-geochemical characteristics show that the granite in the district belongs to calcic rock-high kalium calc-alkali rock,with w(K2O)>w(Na2O)and the Rittman index 0.49 to 2.39.Furthermore,porphyritic granite is S type granite,while biotite granite is I type granite.The rare earth elements are low in mass fraction.LREE’s fractionation degree is evidently high than HREE and with negative Eu anomaly,and are evidently enriched in large ion lithophile element and depleted in high field strength element.Porphyritic granite formed in the continental collision dynamics,with the source rock type being water-containing clay-rich argillaceous rock.While biotite granite formed in the volcanic arc tectonic environment,with the source rock type being heterogeneous sandstone and clastic rocks.
Keywords:
porphyric granite;biotite granite;litho-geochemical characteristics;tectonic settings;Tawangshan Gold Deposit
